CN108267672A - A kind of application method of overhead transmission line fault-indicating system - Google Patents
A kind of application method of overhead transmission line fault-indicating system Download PDFInfo
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- CN108267672A CN108267672A CN201810053032.6A CN201810053032A CN108267672A CN 108267672 A CN108267672 A CN 108267672A CN 201810053032 A CN201810053032 A CN 201810053032A CN 108267672 A CN108267672 A CN 108267672A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The present invention relates to a kind of application methods of overhead transmission line fault-indicating system, according to detailed circuit conduit line map, utilize the line outage repair time, fault detector is installed in power grid high-tension overhead line corresponding position, formulate Earth Fault Detection operating criterion, the operating criterion includes the transient current of detection ground connection moment line capacitance electric discharge, detects the voltage magnitude of circuit phase voltage；Transient current direction and power direction during failure judge.When line failure, using this method according to the installation site of fault detector, grouping is investigated, according to fault detector board turning situation, it is quick to judge faulty section circuit, faulty line is cut off, restores the power transmission of main line, reduce power failure area and power off time, reduce loss of outage to greatest extent.
Description
Technical field
The present invention relates to electric power network technique fields, and in particular to a kind of application method of overhead transmission line fault-indicating system.
Background technology
Singlephase earth fault accounts for the 75% of total accident rate in electric system, and power distribution network generally uses non_direct ground side
Formula (small current neutral grounding system) can operate with failure two hours after singlephase earth fault occurs, can improve confession in this way
The continuity and reliability of electricity reduce emergency stop valve trip number.But in single-phase earthing, when earth current is more than 10A it is possible that production
Raw intermittence electric arc, and cause the overvoltage of maximum 3.5 times of phase voltages, make the insulation weak spot of non-faulting phase that second point occur and connect
Ground, the expansion to cause the accident.Therefore, after ground connection or short trouble occur for high-tension overhead line, it is necessary to search trouble point as early as possible
And exclude in time, power failure area and power off time are reduced, improves power supply reliability.
But aerial more than 30 item of electric line, about 150 km of total track length, be distributed in mostly lonely area,
Plant area is influenced when high-tension overhead line breaks down, but by environment and time, investigates very inconvenient, malfunction elimination
Time is long.Since fault current is faint, many reasons, the phase-to-ground fault detections such as electric arc is unstable are relatively difficult.
Invention content
To overcome the deficiency, it is an object of the invention to put forward a kind of application method of overhead transmission line fault-indicating system,
The technical solution adopted by the present invention to solve the technical problems is：A kind of use of overhead transmission line fault-indicating system
Method, including：
First, high voltage overhead lines road installation fault detector
The technical data of every high-tension line is counted, draws out complete circuit pipeline network figure, acquisition is related
Operation data considers from management measure, technical measures, Construction Measures etc., and prioritization scheme links work at selected spots with that in entire areas, and is formed certainly
High-tension overhead line fault-indicating system under above.
According to detailed circuit conduit line map, using the line outage repair time, in power grid high-tension overhead line corresponding position
Fault detector is installed, high voltage overhead lines line fault indicator installation site is seen below：
A, substation or Switching Station exit, failure judgement is in station or station is outer；
B, at basic routing line and service main, guilty culprit section is indicated；
C, cable and overhead transmission line junction, whether instruction failure is in cut cable；
D, the bifurcations such as overhead line, ring main unit, cable branch box, navigate to branch；
E, for high pressure point of incoming cables, judge user malfunction.
When line failure, according to the installation site of fault detector, grouping is investigated, according to fault detector
Board turning situation quickly judges faulty section circuit, cuts off faulty line, restores the power transmission of main line.
Main line is typically mounted at, disperses no rule, we determine installation by putting into practice according to circuit characteristic distributions
Position.
2nd, Earth Fault Detection operating criterion is formulated
The operating criterion includes the transient current of detection ground connection moment line capacitance electric discharge, detects the electricity of circuit phase voltage
Pressure amplitude value；Transient current direction and power direction during failure judge, are specifically shown in down：
(1) transient current of detection ground connection moment line capacitance electric discharge
During line failure, system is changed to the stable state after failure by the stable state before failure, and there are one transient process, claim
It is transient process, in transient process, the distribution capacity of circuit is caused to discharge over the ground since faulted phase voltage reduces suddenly,
Raising makes the distribution capacity of circuit charge to non-faulting phase voltage suddenly, when the earth fault overwhelming majority is happened at voltage close to peak value
It carves, so transient process is clearly, and then transient current amplitude can be more several times greater than steady-state value to tens times, and circuit is normal
The load current of variation in operational process does not generate it any influence, while also not as the dynamic of detection earth fault
Make criterion；
Since the capacity of transient current value with circuit its distribution capacity of line distribution capacitance electric discharge is closely related, distribution is electric
The size for holding capacity directly depends on the length of circuit, that is to say, that circuit is shorter, then the capacity of the capacitance is just small, and event occurs
Discharge current during barrier is just corresponding smaller, and the size of the current value determines the action response sensitivity of fault detector,
In other words circuit is longer, then the distribution capacity capacity of circuit is bigger, and discharge current is bigger when breaking down, fault detector
Response is just more sensitive.
(2) voltage magnitude of circuit phase voltage is detected
Small current neutral grounding system ungrounded phase-to-ground voltage raising when single-phase earthing occurs, and it is grounded phase-to-ground voltage drop
Low, earth fault instruction constantly monitors the variable condition of line voltage distribution, causes when circuit because ground connection (short circuit) failure occurs
When line voltage distribution is reduced or had a power failure, detection device is by the feedback of status to fault judging circuit monitored at that time, as sentencing
Whether the foundation of which class failure on broken string road if breaking down or occurring.
(3) transient current direction during failure and power direction judge
Failure detector is set by the discharge current of detection line distribution capacitance and line voltage distribution reduction and satisfaction
While tentering value, the moment line power direction broken down and detected discharge current direction are subjected to phase bit comparison,
Due in synchronization, earth current direction before flowing through earth point and earth current direction after earth point is flowed through just
On the contrary, so its phase result of the comparison, which only has a kind of state, can meet set definite value, after earth point
Indicating fault occur error indication.
The invention has the advantages that：When line failure, according to the installation site of fault detector, grouping
It is investigated, according to fault detector board turning situation, quickly judges faulty section circuit, cut off faulty line, restore main line
Power transmission, reduce power failure area and power off time, reduce loss of outage to greatest extent.
Description of the drawings
Fig. 1 shows earth fault schematic diagram for board turning of the present invention.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
A kind of application method of overhead transmission line fault-indicating system according to figure 1, including：
3rd, high voltage overhead lines road installation fault detector
The technical data of every high-tension line is counted, draws out complete circuit pipeline network figure, acquisition is related
Operation data considers from management measure, technical measures, Construction Measures etc., and prioritization scheme links work at selected spots with that in entire areas, and is formed certainly
High-tension overhead line fault-indicating system under above.
According to detailed circuit conduit line map, using the line outage repair time, in power grid high-tension overhead line corresponding position
400 RH-312 type fault detectors are installed, high voltage overhead lines line fault indicator installation site is seen below：
A, substation or Switching Station exit, failure judgement is in station or station is outer；
B, at basic routing line and service main, guilty culprit section is indicated；
C, cable and overhead transmission line junction, whether instruction failure is in cut cable；
D, the bifurcations such as overhead line, ring main unit, cable branch box, navigate to branch；
E, for high pressure point of incoming cables, judge user malfunction.
When line failure, according to the installation site of fault detector, grouping is investigated, according to fault detector
Board turning situation quickly judges faulty section circuit, cuts off faulty line, restores the power transmission of main line.
Main line is typically mounted at, disperses no rule, we determine installation by putting into practice according to circuit characteristic distributions
Position.
4th, Earth Fault Detection operating criterion is formulated
The operating criterion includes the transient current of detection ground connection moment line capacitance electric discharge, detects the electricity of circuit phase voltage
Pressure amplitude value；Transient current direction and power direction during failure judge, are specifically shown in down：
(1) transient current of detection ground connection moment line capacitance electric discharge
During line failure, system is changed to the stable state after failure by the stable state before failure, and there are one transient process, claim
It is transient process, in transient process, the distribution capacity of circuit is caused to discharge over the ground since faulted phase voltage reduces suddenly,
Raising makes the distribution capacity of circuit charge to non-faulting phase voltage suddenly, when the earth fault overwhelming majority is happened at voltage close to peak value
It carves, so transient process is clearly, and then transient current amplitude can be more several times greater than steady-state value to tens times, and circuit is normal
The load current of variation in operational process does not generate it any influence, while also not as the dynamic of detection earth fault
Make criterion；
Since the capacity of transient current value with circuit its distribution capacity of line distribution capacitance electric discharge is closely related, distribution is electric
The size for holding capacity directly depends on the length of circuit, that is to say, that circuit is shorter, then the capacity of the capacitance is just small, and event occurs
Discharge current during barrier is just corresponding smaller, and the size of the current value determines the action response sensitivity of fault detector,
In other words circuit is longer, then the distribution capacity capacity of circuit is bigger, and discharge current is bigger when breaking down, fault detector
Response is just more sensitive.
(2) voltage magnitude of circuit phase voltage is detected
Small current neutral grounding system ungrounded phase-to-ground voltage raising when single-phase earthing occurs, and it is grounded phase-to-ground voltage drop
Low, earth fault instruction constantly monitors the variable condition of line voltage distribution, causes when circuit because ground connection (short circuit) failure occurs
When line voltage distribution is reduced or had a power failure, detection device is by the feedback of status to fault judging circuit monitored at that time, as sentencing
Whether the foundation of which class failure on broken string road if breaking down or occurring.
(3) transient current direction during failure and power direction judge
Failure detector is set by the discharge current of detection line distribution capacitance and line voltage distribution reduction and satisfaction
While tentering value, the moment line power direction broken down and detected discharge current direction are subjected to phase bit comparison,
Due in synchronization, earth current direction before flowing through earth point and earth current direction after earth point is flowed through just
On the contrary, so its phase result of the comparison, which only has a kind of state, can meet set definite value, after earth point
Indicating fault occur error indication.
As shown in Figure 1, shown and 12 still not operating by 3,6,9 board turning of 2# line C phases, both can determine whether out D points ground connection occurs therefore
Barrier.
The present invention is not limited to the embodiment, anyone should learn that the structure made under the enlightenment of the present invention becomes
Change, the technical schemes that are same or similar to the present invention are each fallen within protection scope of the present invention.
The present invention be not described in detail technology, shape, construction part be known technology.
Claims (5)
1. a kind of application method of overhead transmission line fault-indicating system, it is characterised in that：Including：
First, high voltage overhead lines road installation fault detector
According to detailed circuit conduit line map, fault detector is installed in power grid high-tension overhead line corresponding position, when circuit occurs
During failure, according to the installation site of fault detector, grouping is investigated, quick to judge according to fault detector board turning situation
Be out of order a section circuit, cuts off faulty line, restores the power transmission of main line；
2nd, Earth Fault Detection operating criterion is formulated
Earth Fault Detection operating criterion is formulated, the operating criterion includes the transient state electricity of detection ground connection moment line capacitance electric discharge
Stream detects the voltage magnitude of circuit phase voltage；Transient current direction and power direction during failure judge.
2. a kind of application method of overhead transmission line fault-indicating system according to claim 1, it is characterised in that：The height
Pressure fault indicator for overhead lines installation site is seen below：
A, substation or Switching Station exit, failure judgement is in station or station is outer；
B, at basic routing line and service main, guilty culprit section is indicated；
C, cable and overhead transmission line junction, whether instruction failure is in cut cable；
D, the bifurcations such as overhead line, ring main unit, cable branch box, navigate to branch；
E, for high pressure point of incoming cables, judge user malfunction.
3. the transient current of the detection ground connection moment line capacitance electric discharge is as the method for criterion, during line failure,
System is changed to the stable state after failure by the stable state before failure, and there are one transient process, transient process are called, in transient process
In, the distribution capacity of circuit is caused to discharge over the ground since faulted phase voltage reduces suddenly, raising makes non-faulting phase voltage suddenly
The distribution capacity charging of circuit, the earth fault overwhelming majority is happened at voltage close to peak value moment, so transient process is very bright
It is aobvious, and then transient current amplitude can be more several times greater than steady-state value to tens times, variation of the circuit in normal course of operation is born
It carries electric current and any influence is not generated to it, while also not as the operating criterion of detection earth fault.
4. a kind of application method of overhead transmission line fault-indicating system according to claim 1, it is characterised in that：The inspection
The voltage magnitude of survey line road phase voltage is small current neutral grounding system ungrounded phase when single-phase earthing occurs as the method for criterion
Voltage-to-ground increases, and is grounded phase-to-ground voltage reduction, and earth fault instruction constantly monitors the variable condition of line voltage distribution, works as line
Road causes line voltage distribution to reduce or during power failure because ground connection (short circuit) failure occurs, shape that detection device will be monitored at that time
State is fed back in fault judging circuit, as judging whether circuit breaks down or occur the foundation of which class failure.
5. a kind of application method of overhead transmission line fault-indicating system according to claim 1, it is characterised in that：The event
Transient current direction and power direction during barrier judge that the method as criterion is, failure detector is in detection circuit distribution electricity
The discharge current and line voltage distribution of appearance reduce and set by meeting while amplitude, the moment line power that will be broken down
Direction and detected discharge current direction carry out phase bit comparison, due in synchronization, flowing through the ground connection electricity before earth point
Stream direction is exactly the opposite with flowing through earth current direction after earth point, so its phase result of the comparison only has a kind of shape
State can meet set definite value, and error indication occurs so as to avoid the indicating fault after earth point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810053032.6A CN108267672A (en) | 2018-01-19 | 2018-01-19 | A kind of application method of overhead transmission line fault-indicating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810053032.6A CN108267672A (en) | 2018-01-19 | 2018-01-19 | A kind of application method of overhead transmission line fault-indicating system |
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| CN108267672A true CN108267672A (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578228A (en) * | 2020-12-17 | 2021-03-30 | 米格电气江苏有限公司 | Zero-sequence-independent single-phase earth fault discrimination algorithm for power distribution network |
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|---|---|---|---|---|
| CN101975911A (en) * | 2010-10-12 | 2011-02-16 | 思源电气股份有限公司 | Earth fault judging method for overhead line fault indicator |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| CN106501671A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring method of electric distribution network overhead wire failure |
-
2018
- 2018-01-19 CN CN201810053032.6A patent/CN108267672A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975911A (en) * | 2010-10-12 | 2011-02-16 | 思源电气股份有限公司 | Earth fault judging method for overhead line fault indicator |
| CN104764971A (en) * | 2015-03-18 | 2015-07-08 | 广东电网有限责任公司电力科学研究院 | Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator |
| CN106501671A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring method of electric distribution network overhead wire failure |
Non-Patent Citations (1)
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| 石东等: "高压架空线路故障指示***的应用", 《冶金设备管理与维修》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578228A (en) * | 2020-12-17 | 2021-03-30 | 米格电气江苏有限公司 | Zero-sequence-independent single-phase earth fault discrimination algorithm for power distribution network |
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Application publication date: 20180710 |